Human Anatomy And Physiology Unit 3
Learn the integumentary System
Questions and Answers
- 1.
Which one of the following is NOT a primary function of the skin
- A.
Thermoregulation
- B.
Protection
- C.
Cutaneous sensations
- D.
Synthesis of Vitamin D
- E.
Transport
Correct Answer
E. Transport -
- 2.
What type of tissue is the dermis made up from
- A.
Connective
- B.
Muscle
- C.
Nervous
- D.
Epithelial
Correct Answer
A. ConnectiveExplanation
The dermis is made up of connective tissue. Connective tissue provides support and structure to the body. It consists of cells and an extracellular matrix that contains fibers and ground substance. The dermis is located beneath the epidermis and is responsible for providing strength and elasticity to the skin. It also contains blood vessels, nerves, and hair follicles. Connective tissue is characterized by its ability to connect and support different tissues and organs in the body.Rate this question:
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- 3.
The Epidermis contains four main types of cells - keratinocytes, Melanocytes, Langerhan cells, Merkel Cells. Which one of these cells functions with sensory neurons to product sensations of touch
- A.
Keratinocytes
- B.
Melanocytes
- C.
Langerhan cells
- D.
Merkel Cells
Correct Answer
D. Merkel CellsExplanation
Merkel cells function with sensory neurons to produce sensations of touch. These cells are found in the epidermis, the outermost layer of the skin. They are specialized cells that are associated with nerve endings and play a role in the perception of touch. When these cells are stimulated, they send signals to the brain, allowing us to feel sensations such as pressure and texture.Rate this question:
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- 4.
The Epidermis contains four main types of cells - keratinocytes, Melanocytes, Langerhan cells, Merkel Cells. Which one of these cells is responsible for immune responses of the cell?
- A.
Merkel Cells
- B.
Langerhan cells
- C.
Melanocytes
- D.
Keratinocytes
Correct Answer
B. Langerhan cellsExplanation
Langerhan cells are responsible for immune responses of the cell. They are a type of dendritic cell found in the epidermis and play a crucial role in the immune system by capturing antigens and presenting them to T cells. This activates an immune response and helps protect the body against pathogens and foreign substances.Rate this question:
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- 5.
The Epidermis contains four main types of cells - keratinocytes, Melanocytes, Langerhan cells, Merkel Cells. Which one of these cells waterproofs the skin
- A.
Keratinocytes
- B.
Melanocytes
- C.
Langerhan cells
- D.
Merkel Cells
Correct Answer
A. KeratinocytesExplanation
Produce lamellar granules which helps waterproof the skinRate this question:
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- 6.
There are five layers of the epidermis one which is only present in high friction areas that layer is ?
- A.
Stratum basale
- B.
Stratum spinosum
- C.
Stratum granulosum
- D.
Stratum lucidum
- E.
Stratum corneum
Correct Answer
D. Stratum lucidumExplanation
on soles of feet, palms and fingertipsRate this question:
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- 7.
There are two layers of the dermis - the papillary region and the reticular region. Which one of these regions has has projections called dermal papillae that is responsible for fingerprints
- A.
Dermal papillary region
- B.
Reticular region
- C.
Both
- D.
Neither
Correct Answer
A. Dermal papillary regionExplanation
The dermal papillary region is the correct answer because it is the layer of the dermis that contains projections called dermal papillae. These papillae are responsible for creating the ridges and patterns that form fingerprints. The reticular region, on the other hand, does not have these projections and is primarily composed of collagen and elastic fibers. Both regions together make up the two layers of the dermis, but only the dermal papillary region is specifically responsible for fingerprints.Rate this question:
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- 8.
What are the three main pigments that contribute to skin color (tick 3)
- A.
Hemoglobin
- B.
Melanin
- C.
Carotenes
- D.
Vitamin D
- E.
Pigmentation
Correct Answer(s)
A. Hemoglobin
B. Melanin
C. CarotenesExplanation
The three main pigments that contribute to skin color are hemoglobin, melanin, and carotenes. Hemoglobin is a protein in red blood cells that carries oxygen and gives a reddish hue to the skin. Melanin is a pigment produced by specialized cells called melanocytes, which determines the color of the skin, hair, and eyes. Carotenes are yellow or orange pigments found in fruits and vegetables, which can accumulate in the skin and contribute to its color. Vitamin D and pigmentation are not directly related to skin color.Rate this question:
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- 9.
Whch part of the hair makes the hair shaft become erect which has the effect of causing goose bumps
- A.
Hair root Plexus
- B.
Arrector Pili
- C.
Subacious glands
- D.
Bulb
Correct Answer
B. Arrector PiliExplanation
The arrector pili is a small muscle attached to the hair follicle. When this muscle contracts, it causes the hair shaft to become erect, which is commonly known as goosebumps. This involuntary response is often triggered by cold temperatures or emotional stimuli, such as fear or excitement.Rate this question:
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- 10.
There are four types of skin glands, Mammary, Ceruminous, sebaceous and sudoriferous glands. Which one of these glands are the sweat glands
- A.
Mammary
- B.
Sebaceous
- C.
Sudoriferous
- D.
Ceruminous
Correct Answer
C. SudoriferousExplanation
Sudoriferous glands are the sweat glands.Rate this question:
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- 11.
The integumentary system includes all of the following except
- A.
Hair
- B.
Nails
- C.
Skin
- D.
Mucous membranes
Correct Answer
D. Mucous membranesExplanation
The integumentary system is responsible for protecting the body from external factors and maintaining homeostasis. It consists of the skin, hair, and nails, which provide physical protection, regulate body temperature, and prevent water loss. Mucous membranes, on the other hand, are part of the respiratory, digestive, and reproductive systems, not the integumentary system. They line the cavities and passages that connect to the outside of the body and secrete mucus to protect and lubricate these areas. Therefore, mucous membranes are not included in the integumentary system.Rate this question:
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- 12.
Deep wound healing involves four phases. Which phase does "a blood clot form that is loosely attached to the edges of the wound"
- A.
The inflammatory phase
- B.
The granulation phase
- C.
Fibrosis phases
- D.
Maturation phrase
Correct Answer
A. The inflammatory phaseExplanation
During the inflammatory phase of deep wound healing, a blood clot forms that is loosely attached to the edges of the wound. This phase is characterized by the body's response to injury, including the release of inflammatory mediators and the migration of immune cells to the wound site. The blood clot helps to control bleeding and provides a framework for the subsequent phases of healing. It also helps to prevent infection by acting as a barrier against pathogens.Rate this question:
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- 13.
Deep wound healing involves four phases. Which phase does the phagocytes, white blood cells move into the area of the wound?
- A.
The inflammatory phase
- B.
The migratory phase
- C.
Proliferative phases
- D.
Maturation phrase
Correct Answer
A. The inflammatory phaseExplanation
During the inflammatory phase of deep wound healing, phagocytes, which are a type of white blood cells, move into the area of the wound. These phagocytes help to remove any debris or foreign substances present in the wound, and also release various substances that promote the healing process. This phase is characterized by redness, swelling, and heat in the wound area, as the body's immune response is activated to fight off any potential infection.Rate this question:
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- 14.
The cells of the ____ layer of the epidermis are almost dead and undergo a change into cells of the more superficial layers
- A.
Stratum corneum
- B.
Stratum granulosum
- C.
Stratum spinosum
- D.
Stratum germinativum
Correct Answer
B. Stratum granulosumExplanation
The cells of the stratum granulosum layer of the epidermis are almost dead and undergo a change into cells of the more superficial layers.Rate this question:
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- 15.
_____ muscles are assoicated with hair follicles and are positioned in such a way that they contract in reaction to cold or emotional stimuli.
- A.
Arrector pili
- B.
Smooth
- C.
Skeletal
- D.
Subcutaneous
Correct Answer
A. Arrector piliExplanation
Arrector pili muscles are associated with hair follicles and are positioned in such a way that they contract in reaction to cold or emotional stimuli. When these muscles contract, they cause the hair to stand up, resulting in what is commonly known as "goosebumps." This physiological response is believed to have evolved as a way to provide insulation or to make individuals appear larger and more intimidating in response to threats.Rate this question:
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- 16.
The least malignant and most common type of skin cancer is _____.
- A.
Squamous cell carinoma
- B.
Malignant melanoma
- C.
Basal cell carcinoma
- D.
Decubitus ulceration
Correct Answer
C. Basal cell carcinomaExplanation
Basal cell carcinoma is the least malignant and most common type of skin cancer. It arises from the basal cells in the deepest layer of the epidermis. It is characterized by slow growth and rarely spreads to other parts of the body. Squamous cell carcinoma is a more aggressive type of skin cancer that can metastasize to other organs. Malignant melanoma is the most dangerous type of skin cancer, known for its ability to spread rapidly. Decubitus ulceration refers to pressure ulcers and is not a type of skin cancer.Rate this question:
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- 17.
A slight scratch of the skin does not causing bleeding because the epidermis lacks___________.
- A.
Hair follicles
- B.
Blood vessels
- C.
Melanin
- D.
Living cells
Correct Answer
B. Blood vesselsExplanation
A slight scratch of the skin does not cause bleeding because the epidermis lacks blood vessels. Blood vessels are responsible for carrying blood throughout the body, and they are found in the dermis layer of the skin, not the epidermis. The epidermis is the outermost layer of the skin and is primarily composed of dead skin cells. Without blood vessels in the epidermis, there is no direct source of blood supply, which is why a slight scratch does not result in bleeding.Rate this question:
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- 18.
_____ are epidermal cells that contain proteins to keep the skin waterproof
- A.
Melanocytes
- B.
Keratinocytes
- C.
Langerhan's cells
- D.
Merkel's cells
Correct Answer
B. KeratinocytesExplanation
Keratinocytes are epidermal cells that contain proteins to keep the skin waterproof. These cells produce a tough protein called keratin, which forms a protective barrier on the skin's surface. This barrier helps to prevent water loss and protects the underlying layers of the skin from damage. Melanocytes, Langerhan's cells, and Merkel's cells have different functions in the skin, but they do not specifically contribute to the waterproofing of the skin.Rate this question:
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- 19.
All of the following are found in the dermis EXCEPT
- A.
Melanocytes
- B.
Blood vessels
- C.
Sebaceous glands
- D.
Nerve endings
Correct Answer
A. MelanocytesExplanation
Melanocytes are not found in the dermis. Melanocytes are specialized cells found in the basal layer of the epidermis, which is the outermost layer of the skin. These cells are responsible for producing the pigment melanin, which gives color to the skin, hair, and eyes. The dermis, on the other hand, is the layer of skin beneath the epidermis and is composed of connective tissue. It contains blood vessels, sebaceous glands, and nerve endings, but not melanocytes.Rate this question:
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- 20.
The function of melanin is to
- A.
Help control the rate of heat loss by the skin
- B.
Produce a waterproof covering on the surface of the skn
- C.
Produce sweat
- D.
Absorb harmful UV radiation
Correct Answer
D. Absorb harmful UV radiationExplanation
Melanin is a pigment that is responsible for the color of our skin, hair, and eyes. One of its main functions is to absorb harmful ultraviolet (UV) radiation from the sun. When our skin is exposed to UV rays, melanin helps to protect it by absorbing the radiation and preventing it from damaging the DNA in our skin cells. This absorption of UV radiation by melanin reduces the risk of sunburn, skin cancer, and other harmful effects of excessive sun exposure.Rate this question:
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- 21.
________ cells are sensory receptors in the epidermis that are stimulated by touch
- A.
Carotene
- B.
Dermis
- C.
Merkel
- D.
Bulb of Krause
Correct Answer
C. MerkelExplanation
Merkel cells are sensory receptors in the epidermis that are stimulated by touch. These specialized cells are located in the skin's outermost layer, the epidermis, and are responsible for detecting and transmitting tactile sensations to the brain. They play a crucial role in our ability to perceive touch, pressure, and texture.Rate this question:
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- 22.
_________ of epidermal ridges are patterns produces by the dermal papillae
- A.
Toenails
- B.
Hair follicles
- C.
Hair shafts
- D.
Fingerprints
- E.
Goosebumps
Correct Answer
D. FingerprintsExplanation
The correct answer is fingerprints. Epidermal ridges are the raised patterns on the skin's surface, and they are produced by the dermal papillae. These ridges are unique to each individual and form distinct patterns on the fingertips, palms, and soles of the feet. These patterns, known as fingerprints, are used for identification purposes because they are highly specific to each person.Rate this question:
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- 23.
This stratum contains the oldest cells filled with a tough protein that protects other layers from water loss and helps the body resist biological, chemical, and physical assaults.
- A.
Straum basale
- B.
Stratum corneum
- C.
Stratum lucidum
- D.
Stratum spinosum
Correct Answer
B. Stratum corneumExplanation
The correct answer is "stratum corneum." The stratum corneum is the outermost layer of the epidermis and is composed of dead skin cells filled with a tough protein called keratin. This layer acts as a barrier, protecting the underlying layers from water loss and external factors such as biological, chemical, and physical assaults. It is responsible for the skin's strength and resistance.Rate this question:
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- 24.
This is the site of melanin formation and is the most inferior epidermal layer. The cells are constantly divided and millions of cells are produced daily. The daughter cells are pushed up and away from this layer and closer to the skin surface.
- A.
Stratum corneum
- B.
Stratum granulosum
- C.
Stratum basale
- D.
Reticular layer
- E.
Stratum spinosum
Correct Answer
C. Stratum basaleExplanation
The correct answer is stratum basale. The stratum basale is the most inferior epidermal layer where melanin formation occurs. It is responsible for producing millions of cells daily through constant cell division. The daughter cells are then pushed up and away from this layer, moving closer to the skin surface.Rate this question:
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- 25.
A vitamin manufactured in the skin is
- A.
Vitamin c
- B.
Vitamin B
- C.
Vitamin D
- D.
Vitamin K
- E.
Vitamin E
Correct Answer
C. Vitamin DExplanation
Vitamin D is manufactured in the skin when it is exposed to sunlight. The skin produces a precursor molecule called 7-dehydrocholesterol, which is converted into vitamin D when it is exposed to UVB radiation from the sun. This process occurs in the epidermis, the outermost layer of the skin. Vitamin D plays a crucial role in calcium absorption and bone health, and it also has important functions in the immune system and cell growth regulation.Rate this question:
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- 26.
A blackhead is an accumulation of oily material produced by
- A.
Sebaceous glands
- B.
Cyanosis
- C.
Pacinian corpuscle
- D.
Hypodermis
Correct Answer
A. Sebaceous glandsExplanation
A blackhead is formed due to the accumulation of oily material, known as sebum, which is produced by the sebaceous glands. These glands are present in the skin and are responsible for producing sebum, which helps to lubricate and protect the skin. When the sebum becomes trapped in a pore, it oxidizes and turns black, resulting in the formation of a blackhead.Rate this question:
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- 27.
This type of perspiration gland is found in less regions in the body, its secretion contains proteins and other substances that favor bacteria growth, and begin functioning after puberty
- A.
Eccrine gland
- B.
Cutaneous glands
- C.
Sudoriferous gland
- D.
Apocrine gland
Correct Answer
D. Apocrine glandExplanation
Apocrine glands are a type of perspiration gland that is found in fewer regions of the body. Their secretion contains proteins and other substances that provide favorable conditions for bacteria growth. These glands begin functioning after puberty.Rate this question:
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- 28.
A burn patient reports that burns on her hands and face. The burns have blisters, epidermal and some dermal damage, pain, and regeneration is possible. What degree burn does she have?
- A.
1st
- B.
2nd
- C.
3rd
- D.
4th
Correct Answer
B. 2ndExplanation
The patient has second-degree burns because they have blisters, epidermal and some dermal damage, pain, and regeneration is possible. Second-degree burns involve damage to both the epidermis and the dermis layers of the skin.Rate this question:
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- 29.
Heat in the body is circulated throughout the body by the blood vessels. Small blood vessels connected to arteries carrying this heat widen. This allows more blood flow into capillaries in the skin, and result in heat loss from the body through the skin. This is called ________
- A.
Sweating
- B.
Vasodilation
- C.
Vasoconstriction
- D.
ShiveringÂ
Correct Answer
B. VasodilationExplanation
Vasodilation is the correct answer because it refers to the widening of blood vessels, specifically the small blood vessels connected to arteries. When these blood vessels widen, it allows for increased blood flow into the capillaries in the skin. This increased blood flow helps in the transfer of heat from the body to the skin, resulting in heat loss through the skin. Therefore, vasodilation is the process by which heat is circulated throughout the body and leads to heat loss from the body.Rate this question:
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- 30.
Sebaceous glands secrete an oily fluid called sebum, found at the base of hair follicles. The sebum covers the hair and then skin through the same pore. Sebum protects our hair and skin by making it hydrophobic. Many beauty products take away this sebum and dry our hair and skin out. When a sebaceous gland becomes clogged with excess sebum or dead cells, the pore can
- A.
Create a cyst
- B.
Create a freckle
- C.
Form a pimple
- D.
Form a hair papilla
Correct Answer
C. Form a pimpleExplanation
When a sebaceous gland becomes clogged with excess sebum or dead cells, it can lead to the formation of a pimple. The clogged pore traps the sebum and bacteria, causing inflammation and the development of a raised, red bump on the skin. This is a common occurrence during puberty when hormonal changes increase sebum production.Rate this question:
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- 31.
This is the most common type of skin cancer. Cells in the lowest level of the epidermis invade the dermis and hypodermis, and is slow to metastasize. Limiting sun exposure can help prevent these cells from becoming cancerous.
- A.
Squamous cell carinoma
- B.
Basal cell carinoma
- C.
Melanoma
- D.
Lung cancer
Correct Answer
B. Basal cell carinomaExplanation
Basal cell carcinoma is the most common type of skin cancer. It occurs when cells in the lowest level of the epidermis invade the dermis and hypodermis. Unlike other types of skin cancer, basal cell carcinoma is slow to metastasize or spread to other parts of the body. Limiting sun exposure can help prevent these cells from becoming cancerous.Rate this question:
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- 32.
This is the deepest layer of skin. It helps to store energy, insulate the body and is composed of adipose tissue
- A.
Hypodermis
- B.
Hyperdermis
- C.
Ultradermis
- D.
Dermal papillary
Correct Answer
A. HypodermisExplanation
The correct answer is hypodermis. The hypodermis is the deepest layer of skin and is composed of adipose tissue, which helps to store energy and insulate the body. It is also known as the subcutaneous tissue and acts as a cushion and shock absorber for the body.Rate this question:
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- 33.
This skin disorder involves scaly and itches rashes. This can be triggered by an allergic reaction and also from stress, heat, cold, or illness. This can give you an intense itching and burning sensation.
- A.
Hives
- B.
Eczema
- C.
Dandruff
- D.
Psoraiasis
Correct Answer
A. HivesExplanation
Hives, also known as urticaria, is a skin disorder characterized by scaly and itchy rashes. It can be triggered by various factors such as allergic reactions, stress, heat, cold, or illness. Hives can cause intense itching and a burning sensation.Rate this question:
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- 34.
This infectious skin disorder is caused bacteria and causes blisters or sores.
- A.
Impetigo
- B.
Herpes type 1
- C.
Herpes type 2
- D.
Ringworm
- E.
Athlete's foot
Correct Answer
A. ImpetigoExplanation
Impetigo is an infectious skin disorder caused by bacteria. It is characterized by the formation of blisters or sores on the skin. The bacteria responsible for impetigo are usually Staphylococcus aureus or Streptococcus pyogenes. Impetigo is highly contagious and can easily spread through direct contact with the sores or through contaminated objects. It commonly affects children and is more common in warm and humid climates. Treatment usually involves antibiotics to eliminate the bacteria and prevent further spread of the infection.Rate this question:
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- 35.
This is a type of staph infection caused by bacteria and is a strain that is resistant to antibiotics. They may be start as small red bumps that look like a pimple, boil, or spider bite and turn into abscesses.
- A.
Staphylococcus bacteria
- B.
MRSA
- C.
Herpes
- D.
Basal cell carninoma
- E.
Cellulitis
Correct Answer
B. MRSAExplanation
MRSA stands for Methicillin-Resistant Staphylococcus Aureus, which is a type of staph infection caused by bacteria that are resistant to antibiotics. This strain of bacteria can cause small red bumps that resemble pimples, boils, or spider bites, which can then develop into abscesses. Therefore, MRSA is the correct answer as it fits the description provided in the question.Rate this question:
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- 36.
Which one of these is NOT a danger sign for cancer for a mole or lesion of the skin ?
- A.
Asymmerty
- B.
Color varied
- C.
Evolution
- D.
Furry
- E.
Diameter
Correct Answer
D. Furry -
- 37.
Why are broad-spectrum sunscreens recommended to use for sunscreen?
- A.
Because they are at least SPF 70+
- B.
They reflect and absorb UV radiation
- C.
To block both UV-A (skin cancer) and UV-B (sunburn)
- D.
Block UV-C UV radiation (wrinkles and cancer)
Correct Answer
C. To block both UV-A (skin cancer) and UV-B (sunburn)Explanation
Broad-spectrum sunscreens are recommended because they can block both UV-A (which can cause skin cancer) and UV-B (which can cause sunburn) radiation. By providing protection against both types of UV radiation, broad-spectrum sunscreens offer more comprehensive protection for the skin.Rate this question:
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- 38.
The reticular layer of the dermis is most important for providing what two things
- A.
Strength and elasticity to the skin
- B.
Toughness to the skin
- C.
Insulation to prevent heat loss
- D.
The demal papilla, which produce fingerprints
Correct Answer(s)
A. Strength and elasticity to the skin
B. Toughness to the skinExplanation
The reticular layer of the dermis is responsible for providing strength and elasticity to the skin. This layer is made up of dense connective tissue that gives the skin its structural integrity and allows it to stretch and recoil. Additionally, the reticular layer contributes to the toughness of the skin, making it resistant to damage and injury.Rate this question:
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- 39.
Rufus is feeling dangerous and is getting an infinity tattoo with an anchor that says "Never Sink". Tattoos need to go through the layers of skin that quickly regenerates itself to get to the layer that does not. Tattoos also remain in this skin layer because the ink particles are too large to be ingested by the white blood cells that patrol the body and carry foreign bodies away from the skin. What layer of the skin must the needle get to in order for it to be permanent?
- A.
Stratum corneum
- B.
Stratum basale
- C.
Dermis
- D.
Hypodermis
- E.
Hyperdermis
Correct Answer
C. DermisExplanation
The needle must get to the dermis layer of the skin in order for the tattoo to be permanent. This layer is located beneath the epidermis and contains the sweat glands, hair follicles, blood vessels, and nerve endings. The dermis is more stable and does not regenerate as quickly as the outer layers of the skin, allowing the ink particles to remain in place and create a permanent tattoo.Rate this question:
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- 40.
Two tissue types that regenerate wounds with scar tissue are
- A.
Epithelial tissue
- B.
Skin epidermis
- C.
Cardiac muscle
- D.
Nervous tissue
- E.
Bone
- F.
Fibrous connective
Correct Answer(s)
C. Cardiac muscle
D. Nervous tissueExplanation
Cardiac muscle and nervous tissue are the two tissue types that regenerate wounds with scar tissue. Cardiac muscle has limited regenerative capacity, so when it is damaged, it forms scar tissue instead of fully regenerating. Similarly, nervous tissue also has limited regenerative ability, and when it is injured, it forms scar tissue as well. This is because both cardiac muscle and nervous tissue have specialized functions and structures that make complete regeneration difficult.Rate this question:
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- 41.
What wound healing event stage is it when delicate pink tissue composed or new capillaries grow into the damaged area from undamaged blood vessels. These capillaries are fragile and bleed freely when a scab is picked away.
- A.
Inflammation
- B.
Granulation tissue forms
- C.
Regeneration and fibrosis effect permanent repair
- D.
Immune response
Correct Answer
B. Granulation tissue formsExplanation
During the stage of granulation tissue formation, delicate pink tissue composed of new capillaries grows into the damaged area from undamaged blood vessels. These capillaries are fragile and bleed freely when a scab is picked away. This stage is characterized by the development of new blood vessels and the formation of granulation tissue, which is rich in collagen and other components necessary for wound healing.Rate this question:
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- 42.
Wound healing occurs by fibrosis which is the formation of scar tissue or by _________. which is the replacement of destroyed tissue by the same kind of cells. Which one occurs depends on the severity of the injury or the type of tissue damaged.
- A.
Regeneration
- B.
Inflammation
- C.
Granulation
- D.
Immune response
Correct Answer
A. RegenerationExplanation
Regeneration is the correct answer because it refers to the process of replacing damaged tissue with the same kind of cells. This occurs when the injury is not severe and the body is able to repair the damaged tissue without the formation of scar tissue.Rate this question:
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- 43.
You have just gotten a paper cut. It is very painful but doesn't bleed. The cut penetrated into the ____
- A.
Dermis
- B.
Epidermis
- C.
Dermis and epidermis
- D.
Hypodermis
Correct Answer
B. EpidermisExplanation
The correct answer is epidermis. The epidermis is the outermost layer of the skin, and it is responsible for protecting the underlying tissues. A paper cut that is painful but doesn't bleed indicates that the cut has penetrated the epidermis but has not reached the deeper layers of the skin such as the dermis or hypodermis.Rate this question:
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- 44.
Why do no skin cancers develop from stratum corneum cells?
- A.
A protein protects it from the UV radiation
- B.
Vitamin D protects this layer
- C.
It is nourished by blood vessels
- D.
They are dead
Correct Answer
D. They are deadExplanation
The stratum corneum cells are dead, meaning they lack the ability to divide and replicate. Skin cancers develop from abnormal cell growth and division, so the dead cells in the stratum corneum cannot undergo these changes and therefore do not give rise to skin cancers.Rate this question:
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